Siemens SITRANS LH300 Compact Operating Instructions page 9

5 Connecting
5.1 Basic safety instructions
WARNING
Maximum cable length exceeded for devices with type of protection "Intrinsic safety Ex i"
Danger of explosion in hazardous areas.
Observe the maximum permissible cable length in order to comply with the requirements for devices with type of protection
"Intrinsic safety Ex i".
WARNING
Unsuitable cables, cable glands and/or plugs
Risk of explosion in hazardous areas.
Use only cable glands/plugs that comply with the requirements for the relevant type of protection.
•
Tighten the cable glands in accordance with the torques specified in Technical specifications (Page 15).
•
Close unused cable inlets for the electrical connections.
•
When replacing cable glands use only cable glands of the same type.
•
After installation check that the cables are seated firmly.
•
WARNING
Improper power supply
Danger of explosion in hazardous areas and loss of device safety as a result of incorrect power supply, e.g. using direct
current instead of alternating current.
Connect the device in accordance with the specified power supply and signal circuits. The relevant specifications can
•
be found in the certificates, in Chapter "Technical specifications (Page 15)" or on the nameplate.
Always power the device with limited energy. Observe the following standards on limited energy: UL61010-1 3rd
•
Edition, Section 9.3 or LPS (Low Power Supply) in accordance with UL60950-1 or Class 2 in accordance with UL1310
or UL1585.
WARNING
Unsafe extra-low voltage
Risk of explosion in hazardous areas due to voltage flashover.
Connect the device to an extra-low voltage with safe isolation (SELV).
•
WARNING
Lack of equipotential bonding
Risk of explosion through compensating currents or ignition currents through lack of equipotential bonding.
Ensure that the device is potentially equalized.
•
Exception: It may be permissible to omit connection of the equipotential bonding for devices with type of protection
"Intrinsic safety Ex i".
WARNING
Unprotected cable ends
Risk of explosion through unprotected cable ends in hazardous areas.
Protect unused cable ends in accordance with IEC/EN 60079-14.
•
SITRANS LH300 (7MF1575..) Transmitter for hydrostatic level
A5E37897183-AA, 09/2016
11